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Too much speculation and personal opinion
Fragment of a discussion from Talk:Gods
"Knight of Light" just means Paladin (in the real sense, as opposed to Emain's paladins). Lugh was simply the first Paladin, before your character even existed, so during G1-G2 that's the only person the NPCs know as the Knight of Light. It's not surprising that G3 would call you that, considering you're a Paladin, then.